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authorSujit Reddy Thumma <sthumma@codeaurora.org>2013-07-30 00:36:00 +0530
committerJames Bottomley <JBottomley@Parallels.com>2013-08-26 12:51:26 +0400
commit62694735ca95c74dac4eb9068d59801ac0ddebaf (patch)
tree513e9886fe0edb36b7c4722d3657bd8da85ff11b /drivers/scsi/ufs
parent66ec6d59407baf7c7a1f99c79d632403c1064266 (diff)
downloadop-kernel-dev-62694735ca95c74dac4eb9068d59801ac0ddebaf.zip
op-kernel-dev-62694735ca95c74dac4eb9068d59801ac0ddebaf.tar.gz
[SCSI] ufs: Add runtime PM support for UFS host controller driver
Add runtime PM helpers to suspend/resume UFS controller at runtime. Enable runtime PM by default for pci and platform drivers as the initialized hardware can suspend if it is not used after bootup. Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org> Signed-off-by: Santosh Y <santoshsy@gmail.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/ufs')
-rw-r--r--drivers/scsi/ufs/ufshcd-pci.c62
-rw-r--r--drivers/scsi/ufs/ufshcd-pltfrm.c50
-rw-r--r--drivers/scsi/ufs/ufshcd.c8
3 files changed, 113 insertions, 7 deletions
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index 48be39a..57ea9dd 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -35,6 +35,7 @@
#include "ufshcd.h"
#include <linux/pci.h>
+#include <linux/pm_runtime.h>
#ifdef CONFIG_PM
/**
@@ -44,7 +45,7 @@
*
* Returns -ENOSYS
*/
-static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+static int ufshcd_pci_suspend(struct device *dev)
{
/*
* TODO:
@@ -61,7 +62,7 @@ static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
*
* Returns -ENOSYS
*/
-static int ufshcd_pci_resume(struct pci_dev *pdev)
+static int ufshcd_pci_resume(struct device *dev)
{
/*
* TODO:
@@ -71,8 +72,45 @@ static int ufshcd_pci_resume(struct pci_dev *pdev)
return -ENOSYS;
}
+#else
+#define ufshcd_pci_suspend NULL
+#define ufshcd_pci_resume NULL
#endif /* CONFIG_PM */
+#ifdef CONFIG_PM_RUNTIME
+static int ufshcd_pci_runtime_suspend(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_suspend(hba);
+}
+static int ufshcd_pci_runtime_resume(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_resume(hba);
+}
+static int ufshcd_pci_runtime_idle(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_idle(hba);
+}
+#else /* !CONFIG_PM_RUNTIME */
+#define ufshcd_pci_runtime_suspend NULL
+#define ufshcd_pci_runtime_resume NULL
+#define ufshcd_pci_runtime_idle NULL
+#endif /* CONFIG_PM_RUNTIME */
+
/**
* ufshcd_pci_shutdown - main function to put the controller in reset state
* @pdev: pointer to PCI device handle
@@ -91,6 +129,9 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
{
struct ufs_hba *hba = pci_get_drvdata(pdev);
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+
disable_irq(pdev->irq);
ufshcd_remove(hba);
pci_release_regions(pdev);
@@ -168,6 +209,8 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
}
pci_set_drvdata(pdev, hba);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
return 0;
@@ -182,6 +225,14 @@ out_error:
return err;
}
+static const struct dev_pm_ops ufshcd_pci_pm_ops = {
+ .suspend = ufshcd_pci_suspend,
+ .resume = ufshcd_pci_resume,
+ .runtime_suspend = ufshcd_pci_runtime_suspend,
+ .runtime_resume = ufshcd_pci_runtime_resume,
+ .runtime_idle = ufshcd_pci_runtime_idle,
+};
+
static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = {
{ PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
{ } /* terminate list */
@@ -195,10 +246,9 @@ static struct pci_driver ufshcd_pci_driver = {
.probe = ufshcd_pci_probe,
.remove = ufshcd_pci_remove,
.shutdown = ufshcd_pci_shutdown,
-#ifdef CONFIG_PM
- .suspend = ufshcd_pci_suspend,
- .resume = ufshcd_pci_resume,
-#endif
+ .driver = {
+ .pm = &ufshcd_pci_pm_ops
+ },
};
module_pci_driver(ufshcd_pci_driver);
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index c42db40..c5c2835 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -34,6 +34,7 @@
*/
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include "ufshcd.h"
@@ -87,6 +88,40 @@ static int ufshcd_pltfrm_resume(struct device *dev)
#define ufshcd_pltfrm_resume NULL
#endif
+#ifdef CONFIG_PM_RUNTIME
+static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_suspend(hba);
+}
+static int ufshcd_pltfrm_runtime_resume(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_resume(hba);
+}
+static int ufshcd_pltfrm_runtime_idle(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_idle(hba);
+}
+#else /* !CONFIG_PM_RUNTIME */
+#define ufshcd_pltfrm_runtime_suspend NULL
+#define ufshcd_pltfrm_runtime_resume NULL
+#define ufshcd_pltfrm_runtime_idle NULL
+#endif /* CONFIG_PM_RUNTIME */
+
/**
* ufshcd_pltfrm_probe - probe routine of the driver
* @pdev: pointer to Platform device handle
@@ -122,14 +157,22 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
goto out;
}
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
err = ufshcd_init(dev, &hba, mmio_base, irq);
if (err) {
dev_err(dev, "Intialization failed\n");
- goto out;
+ goto out_disable_rpm;
}
platform_set_drvdata(pdev, hba);
+ return 0;
+
+out_disable_rpm:
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
out:
return err;
}
@@ -144,6 +187,8 @@ static int ufshcd_pltfrm_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
+ pm_runtime_get_sync(&(pdev)->dev);
+
disable_irq(hba->irq);
ufshcd_remove(hba);
return 0;
@@ -157,6 +202,9 @@ static const struct of_device_id ufs_of_match[] = {
static const struct dev_pm_ops ufshcd_dev_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
+ .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
+ .runtime_resume = ufshcd_pltfrm_runtime_resume,
+ .runtime_idle = ufshcd_pltfrm_runtime_idle,
};
static struct platform_driver ufshcd_pltfrm_driver = {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 4267246..1f2caa0 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2169,6 +2169,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
u32 status = 0;
hba = container_of(work, struct ufs_hba, eeh_work);
+ pm_runtime_get_sync(hba->dev);
err = ufshcd_get_ee_status(hba, &status);
if (err) {
dev_err(hba->dev, "%s: failed to get exception status %d\n",
@@ -2184,6 +2185,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
__func__, err);
}
out:
+ pm_runtime_put_sync(hba->dev);
return;
}
@@ -2196,9 +2198,11 @@ static void ufshcd_fatal_err_handler(struct work_struct *work)
struct ufs_hba *hba;
hba = container_of(work, struct ufs_hba, feh_workq);
+ pm_runtime_get_sync(hba->dev);
/* check if reset is already in progress */
if (hba->ufshcd_state != UFSHCD_STATE_RESET)
ufshcd_do_reset(hba);
+ pm_runtime_put_sync(hba->dev);
}
/**
@@ -2500,6 +2504,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
ufshcd_force_reset_auto_bkops(hba);
scsi_scan_host(hba->host);
+ pm_runtime_put_sync(hba->dev);
out:
return;
}
@@ -2721,6 +2726,9 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
*hba_handle = hba;
+ /* Hold auto suspend until async scan completes */
+ pm_runtime_get_sync(dev);
+
async_schedule(ufshcd_async_scan, hba);
return 0;
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